The Boxmasters are a great study in juxtapositions. Their band’s sound is a fusion of 60s British Invasion and hillbilly music. Their original songs range from poignant to tongue-in-cheek. They are serious musicians, but their record is undeniably fun. And on their tour—including a performance at the House of Blues in Hollywood this Sunday—they serve as their own opening act (more about that later in this interview)....